Dynamics of the transition from the metastable tetragonal st12 to the diamond-cubic phase in germanium characterized by neutron spectroscopy

Haberl, Bianca; Donnelly, Mary -Ellen; Pineda, Lianett; Ladygin, Vladimir; Granroth, Garrett E.

doi:10.1103/hw9y-y2cn

Dynamics of the transition from the metastable tetragonal st12 to the diamond-cubic phase in germanium characterized by neutron spectroscopy

Journal Article · Thu Jul 24 00:00:00 EDT 2025 · Physical Review B

DOI:https://doi.org/10.1103/hw9y-y2cn· OSTI ID:2587480

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Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Canadian Light Source, Saskatoon (Canada)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); North Carolina State University, Raleigh, NC (United States)
California Institute of Technology, Pasadena, CA (United States)

The complex phase diagram of germanium allows for exotic crystalline phases recoverable from high pressure. Among these, the tetragonal st12 phase is unusual as it shares characteristics with amorphous Ge resulting in desirable band-gap characteristics. Here, we leverage a high neutron flux and large volume pressure capabilities to characterize st12-Ge and its dynamics upon conversion to diamond-cubic Ge with inelastic neutron scattering. Here, we exploit the characteristics of time-of-flight neutron scattering for time-resolved investigations. This analysis may suggest the existence of a transient disordered state upon annealing befitting the known structural relationship between st12-Ge and amorphous Ge, a relationship that can open the potential for band-gap tuning.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2587480

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 1 Vol. 112; ISSN 2469-9950; ISSN 2469-9969

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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